### Answer The

voice_emotion

parameter controls the emotional tone of the agent's voice, but it's currently only supported for specific TTS providers [(1) ]() [(2) ]() [(3) ]() [(4) ]() . According to the documentation, emotional voice settings are "currently supported for Cartesia and Minimax TTS providers" . Even though you're using the same voice (Cimo) , the availability of emotional voice settings depends on which TTS provider that voice comes from . For example: -

cartesia-Cimo

would support

voice_emotion

-

minimax-Cimo

would support

voice_emotion

-

retell-Cimo

or voices from other providers would not have this option All agents have access to

voice_speed

and

volume

settings regardless of provider . The

voice_emotion

field accepts values like

calm

,

sympathetic

,

happy

,

sad

,

angry

,

fearful

, or

surprised

.

​ To learn more, see the sources I considered: [[1] List Voice Agents](https://docs.retellai.com/api-references/list-agents) [[2] Create Voice Agent](https://docs.retellai.com/api-references/create-agent) [[3] Update Voice Agent](https://docs.retellai.com/api-references/update-agent) [[4] Get Agent Versions](https://docs.retellai.com/api-references/get-agent-versions) ​

Feel free to tag @AI Evy with additional questions. I also appreciate feedback, it helps me improve.